* Modified __init_getch to use termcap handle that has been allocated
(_cursesi_genbuf) instead of refetching it.
* Make wgetstr support erase - this is not a full blown SUSv2 version
but it is a start.
* Added code to __restartwin to restore meta and cursor visibility states
* Added code to __stopwin to disable meta.
* Added the *line group of functions for drawing character lines.
(this is a requirement of SUSv2) - the old macro behaviour can be
restored by defining _CURSES_USE_MACROS.
Changed function prototypes to use ANSI style.
All externally visible functions now have ANSI style declarations.
